Total rubbish! My phone, pad and computers are macs and I just logged into my server on them all and tapped on a wave file. They ALL play it fine. MP3, M4a, wav and aiff makes no difference. Cubase on my macs plays the stuff created in my pcs.
I have a three in one adaptor I can stuff into the iphone, an android phone or a usb socket and have never had any problems with audio files. If you have an iPhone you can click on a web link, like on this forum and play somebodies wav file. If you download it, the Apple Music app plays it.
to rfr
your Mac computer will copy and paste wave like any other file type, on the phone, the issue is that there isnt really an app to do file management like finder on the macs. The phones are designed to not show dangerous stuff to the users. there are file manager apps available though. My MacBook seems happy to read the phones files though?